Technical Field
[0001] The present invention relates to a heat pump system, temperature adjustment method,
and program.
Background Art
[0002] In an air-conditioning system installed in a large construction such as an office
building, multiple indoor units provided respectively on the floors or in the floor
divisions are connected to an outdoor unit provided on the rooftop via refrigerant
pipes. Thus, a heat pump conducting heat exchange between the indoor air and outdoor
air is constructed.
[0003] In a multi-room air-conditioning system of the above kind, multiple indoor units
are connected to a single outdoor unit in parallel. Therefore, the capacity (capability)
of the outdoor unit is determined based on the total of the capacities (the total
capacity) of the indoor units connected to the outdoor unit.
[0004] However, if the capacity of the outdoor unit is smaller than the total capacity of
the indoor units, it is sometimes difficult to supply the refrigerant to the indoor
units at flow rates requested by the indoor units. In such a case, for example, it
is necessary to give priority in supply of the refrigerant to the indoor unit requesting
the largest quantity of refrigerant and divide the remaining refrigerant among the
remaining indoor units (for example, see Patent Literature 1).
[0005] JP H07 180924 A which is the application corresponding to the above mentioned background art discloses:
An air conditioner that comprises an outdoor unit A having a compressor, an outdoor
heat exchanger, and a pressure reducing unit, a plurality of indoor units C, D, E
having indoor heat exchangers, a refrigerating cycle formed by sequentially connecting
parallel units of the compressors, the outdoor exchangers, the reducing unit and the
indoor exchangers, and flow regulating valves 9a, 9b, 9c for controlling refrigerant
input amounts to the respective indoor exchangers. When total sum of required capacities
from the indoor units exceeds the capacity of the outdoor unit, an opening of the
valve 9a is so controlled as to, for example, preferentially feed refrigerant flow
rate of the required capacity to the indoor unit having maximum required capacity
such as the unit C, and the openings of the valves 9b, 9c are so controlled as to
distribute the residual refrigerant flow rate to the residual indoor units, D. E.
JP H07 180924 A discloses a heat pump system according to the preamble of claim 1.
Citation List
Patent Literature
[0006] Patent Literature 1: Japanese Patent No.
3242246.
Summary of Invention
[0007] The device disclosed in the Patent Literature 1 gives priority in supply of the refrigerant
to the indoor unit requesting the largest quantity of refrigerant. Therefore, the
other indoor units are supplied with smaller quantities of refrigerant and some rooms
may possibly be less comfortable.
[0008] Furthermore, when a cascade refrigerating cycle comprising multiple refrigerating
cycles is configured between the outdoor unit and a temperature adjustment target,
it is difficult to correct the heat quantity supplied to the temperature adjustment
target upon change in the heat quantity requested by the temperature adjustment target.
[0009] The present invention is developed with the view of the above situation and an objective
of the present invention is to efficiently adjust the temperature of a temperature
adjustment target in accordance with the priority specified by the user.
Solution to Problem
[0010] The solution is disclosed in the independent claims.
Advantageous Effects of Invention
[0011] With the present invention, for example, as the user enters priorities assigned to
the indoor units, the refrigerant is distributed to the indoor units in accordance
with the priorities. Then, the target temperatures of the indoor air can be adjusted
efficiently without making the user less comfortable.
Brief Description of Drawings
[0012]
FIG. 1 is a block diagram of the heat pump system according to Embodiment 1;
FIG. 2 is a block diagram showing the pipeline of the heat pump system;
FIG. 3 is a block diagram showing the control system of the heat pump system;
FIG. 4 is a block diagram of the control device not forming part of the claimed invention;
FIG. 5 is a flowchart showing a series of processing executed by the control device;
FIG. 6 is a block diagram of the heat pump system according to Embodiment 2;
FIG. 7 is a block diagram showing the control system of an indoor unit; and
FIG. 8 is a flowchart showing a series of processing executed by the control device.
Description of Embodiments
«Embodiment 1 »
[0013] Embodiment 1 of the present invention will be described hereafter with reference
to the drawings. FIG. 1 is a block diagram of a heat pump system 10 installed in an
office building 100 by way of example. The office building 100 has three work spaces
A1, A2, and A3 and a kitchen B1. The heat pump system 10 has indoor units 30A to 30C
installed in the work spaces A1 to A3 and an indoor unit 40 installed in the kitchen
B1 of the office building 100, and an outdoor unit 20 installed on the rooftop of
the office building 100. The indoor units 30A to 30C and 40 are connected to the outdoor
unit 20 via a circulating system 50 circulating the refrigerant.
[0014] FIG. 2 is a diagram showing the pipeline of the heat pump system 10. As shown in
FIG. 2, the outdoor unit 20 has a heat exchanger 23, a compressor 21, and a four-way
valve 22. These components are connected via a refrigerant pipe 26.
[0015] The heat exchanger 23 is, for example, a cross fin type fin and tube heat exchanger
having a heat transfer tube, a heat-releasing fin, and an electric fan cooling the
heat-releasing fin. The heat exchanger 23 functions as a condenser when the heat pump
system 10 is in cooling operation and as an evaporator when the heat pump system 10
is in heating operation.
[0016] The compressor 21 is, for example, a capacitive compressor comprising an inverter
motor. The compressor 21 compresses the refrigerant and discharges the refrigerant
to the four-way valve 22.
[0017] The four-way valve 22 is a valve to switch the direction of the refrigerant running
through the heat exchanger 23. The four-way valve 22 is switched to circulate the
refrigerant in the arrowed direction Aa when the heat pump system 10 is in cooling
operation, and to circulate the refrigerant in the arrowed direction Ab when the heat
pump system 10 is in heating operation. Here, chlorofluorocarbon R410A is used as
the refrigerant.
[0018] The outdoor unit 20 having the above configuration is installed on the rooftop of
the office building 100 as shown in FIG. 1, and conducts heat exchange between the
refrigerant supplied via the circulating system 50 as the first circulating system
and the outdoor air.
[0019] The indoor unit 30A is a device for cooling or heating the indoor air according to
a temperature adjustment target. As shown in FIG. 2, the indoor unit 30A has a heat
exchanger 31 and an expansion valve 32. The heat exchanger 31 and expansion valve
32 are connected in series by a refrigerant pipe 35.
[0020] The heat exchanger 31 has a configuration equivalent to the above-described heat
exchanger 23. The heat exchanger 23 conducts heat exchange between the refrigerant
running through the heat exchanger 23 and the indoor air.
[0021] The expansion valve 32 is an electric expansion valve functioning as adjustment means
for adjusting the flow rate of the refrigerant running through the heat exchanger
31. The expansion valve 42 comprises, for example, a valve and a stepping motor adjusting
the degree of opening of the valve.
[0022] The indoor unit 30A having the above configuration is installed, for example, on
the ceiling of the work space A1 of the office building 100 as shown in FIG. 1. Then,
the indoor unit 30A conducts heat exchange between the refrigerant supplied via the
circulating system 50 and the air in the work space A1.
[0023] The indoor units 30B and 30C have a configuration equivalent to the above-described
indoor unit 30A. The indoor units 30B and 30C are installed on the ceilings of the
work spaces A2 and A3 of the office building 100, respectively. The indoor units 30B
and 30C conduct heat exchange between the refrigerant supplied via the circulating
system 50 and the air in the work spaces A2 and A3, respectively.
[0024] The indoor unit 40 is a device for cooling or heating the tap water according to
a temperature adjustment target. As shown in FIG. 2, the indoor unit 40 has a heat
exchanger 41 and an expansion valve 42. The heat exchanger 41 and expansion valve
42 are connected in series by the refrigerant pipe 35.
[0025] The heat exchanger 41 is a plate-type heat exchanger. The heat exchanger 41 conducts
heat exchange between the tap water running through the heat exchanger 41 by means
of a water-supply pump 60 and the refrigerant.
[0026] The expansion valve 42 is an electronic expansion valve for adjusting the flow rate
of the refrigerant running through the heat exchanger 41. The expansion valve 42 comprises,
for example, a valve and a stepping motor adjusting the degree of opening of the valve.
[0027] The indoor unit 40 having the above configuration is installed in the kitchen B1
of the office building 100 as shown in FIG. 1. Then, the indoor unit 40 conducts heat
exchange between the refrigerant supplied via the circulating system 50 and the tap
water running through a water pipe 61. Thus, for example, the tap water running into
a hot water dispenser from the water pipe 61 is preheated.
[0028] As shown in FIG. 2, the refrigerant pipes 50a and 50b constituting the circulating
system 50 and the refrigerant pipe 26 constituting the outdoor unit 20 are connected
by joints 24 and 25. Furthermore, the refrigerant pipes 50a and 50b and the refrigerant
pipes 35 constituting the indoor units 30A to 30B are connected by joints 33 and 34.
Furthermore, the refrigerant pipes 50a and 50b constituting the circulating system
50 and the refrigerant pipe 47 constituting the indoor unit 40 are connected by joints
43 and 44. Thus, a heat pump type refrigerating cycle is constituted in which the
indoor units 30A to 30C and indoor unit 40 are connected to the outdoor unit 20 in
parallel.
[0029] FIG. 3 is a block diagram showing the control system of the heat pump system 10.
As shown in FIG. 3, the outdoor unit 20 of the heat pump system 10 has an outdoor
control unit 120.
[0030] The outdoor control unit 120 communicates with the indoor units 30A to 30C and 40
and acquires a priority P (n) and information presenting a requested quantity Q (requested
quantity information), which will be described later, from the indoor units 30A to
30C and 40. Then, the outdoor control unit 120 drives the compressor 21 according
to the acquired requested quantity information. The outdoor control unit 120 has a
control device 201 and a drive device 202.
[0031] FIG. 4 is a block diagram of the control device 201 not forming part of the claimed
invention. As shown in FIG. 4, the control device 201 is a microcomputer having a
CPU (central processing unit) 201a, a main storage 201b, an auxiliary storage 201c,
an interface 201d, and a bus 201e connecting these components to each other.
[0032] The main storage 201b has a volatile memory such as a DRAM (dynamic random access
memory) or SRAM (static random access memory). The main storage 201b is used as the
work area of the CPU 201a.
[0033] The auxiliary storage 201c has a nonvolatile memory such as a magnetic disc or flash
memory. The auxiliary storage 201c stores programs executed by the CPU 201a and information
regarding various parameters.
[0034] The interface 201d is configured with, for example, a serial interface. The CPU 201a
communicates with the indoor units 30A to 30C and 40 via the interface 201d.
[0035] Returning to FIG. 3, the drive device 202 has an inverter circuit for driving the
inverter motor of the compressor 21 and a drive circuit for driving the four-way valve
22. The drive device 202 applies a drive voltage of which the frequency f is modulated
based on instruction from the control device 201 to the inverter motor constituting
the compressor 21. Thus, the inverter motor constituting the compressor 21 rotates
at a rotation speed corresponding to the frequency f. Furthermore, the drive device
202 drives the four-way valve 22 based on instruction from the control device 201
to switch the direction of the refrigerant running through the heat exchanger 23 to
the arrowed direction Aa or to the arrowed direction Ab.
[0036] As shown in FIG. 3, the indoor unit 30A has an indoor control unit 130A. The indoor
control unit 130A is a device to control the expansion valve 32 of the indoor unit
30A so as to adjust the flow rate of the refrigerant running through the heat exchanger
31. The indoor control unit 130A has a control device 301, an inputter 302, a temperature
sensor 303, and a valve drive circuit 304.
[0037] The inputter 302 is, for example, a remote control device installed on a wall of
the work space A1. The inputter 302 has a GUI (graphical user interface) comprising
a liquid crystal display and touch panel or an interface comprising input keys. The
user can enter various kinds of information into the control device 301 via the inputter
302. Examples of information entered into the control device 301 include set temperatures,
information presenting the airflow rate from the indoor unit 30A, and information
presenting the priority P (n) of the indoor unit 30A that is described later with
regard to the work space A1.
[0038] The priority P (n) can be entered by numbers. For example, if there are three levels
of priority, an indoor unit given a priority "3" has the highest priority, an indoor
unit given a priority "2" has the second highest priority, and an indoor unit given
a priority "1" has the lowest priority. In this embodiment, the priorities given to
the indoor units are as follows by way of example.
[0039] The temperature sensor 303 is a sensor for detecting the temperature of the air entering
the heat exchanger 31 by means of an electric fan. The temperature sensor 303 can
be, for example, a thermistor of which the resistance value changes in accordance
with the temperature. The control device 301 measures the resistance value of the
temperature sensor 303 so as to measure the temperature of the air entering the electric
fan, namely the room temperature of the work space A1.
[0040] Receiving instruction from the control device 301, the valve drive circuit 304 drives
the stepping motor of the expansion valve 32 to adjust the degree of opening of the
expansion valve 32, thus adjusting the flow rate of the refrigerant running through
the heat exchanger 31.
[0041] The control device 301 has, like the control device 201 of the outdoor control unit
120, a CPU, a main storage, an auxiliary storage, and an interface. The control device
301 obtains the refrigerant flow rate necessary at the indoor unit 30A from information
entered by the user via the inputter 302 and the room temperature of the work space
A1 that is measured by the temperature sensor 303. This flow rate means the refrigerant
flow rate necessary for the indoor unit 30A to implement an expected performance.
[0042] The necessary refrigerant flow rate can be obtained by, for example, multiplying
the difference (T
i - T
r) between a set temperature T
i set by the user and the measured room temperature T
r by a unique coefficient a1 determined for each indoor unit. Obtaining the refrigerant
flow rate a1 (T
i - T
r) necessary at the indoor unit 30A, the control device 201 outputs information presenting
the obtained flow rate to the outdoor unit 20.
[0043] Furthermore, the control device 301 obtains the degree of opening of the expansion
valve 32 based on information from the control device 201 of the outdoor unit 20.
[0044] The degree of opening of the expansion valve 32 can be obtained by, for example,
multiplying a supply quantity V by a unique coefficient a2 determined for each indoor
unit provided that V is the supply quantity of refrigerant supplied from the control
device 201 to the indoor unit 30A. The control device 201 adjusts the degree of opening
of the expansion valve 32 to a2 · V via the valve drive circuit 304.
[0045] The indoor units 30B and 30C have indoor control units 130B and 130C. The indoor
control units 130B and 130C are each a device to control the expansion valve 32 of
the indoor unit 30B or 30C to adjust the flow rate of the refrigerant running through
the heat exchanger 31. Like the above-described indoor control unit 130A, the indoor
control units 130B and 130C have a control device 301, an inputter 302, a temperature
sensor 303, and a valve drive circuit 304. The indoor control units 130B and 130C
function like the indoor control unit 130A.
[0046] The indoor unit 40 has an indoor control unit 140. The indoor control unit 140 is
a device to control the expansion valve 42 to adjust the flow rate of the refrigerant
running through the heat exchanger 41. The indoor control unit 140 has a control device
401, an inputter 402, and a temperature sensor 403.
[0047] The inputter 402 has an interface comprising, for example, a dial or push buttons
provided on the enclosure of the indoor unit 40. The user can enter into the control
device 401 supplied hot-water temperatures and information presenting the priority
P (n) of the indoor unit 30A described later via the inputter 402.
[0048] The temperature sensor 403 is a sensor for detecting the temperature of the tap water
after heat exchange with the refrigerant. The temperature sensor 303 is provided on
the water pipe 61 connected to the secondary side (discharge side) of the heat exchanger
41. The temperature sensor 403 can be, for example, a thermistor of which the resistance
value changes in accordance with the temperature. The control device 401 measures
the resistance value of the temperature sensor 403 to measure the temperature (water
temperature) of the tap water after passing through the heat exchanger 41.
[0049] Receiving instruction from the control device 401, a valve drive circuit 404 drives
the stepping motor of the expansion valve to adjust the degree of opening of the expansion
valve 42, thus adjusting the flow rate of the refrigerant running through the heat
exchanger 31.
[0050] Like the outdoor control unit 120 and indoor control units 130A to 130C, the control
device 401 has a CPU, a main storage, an auxiliary storage, and an interface. The
control device 401 obtains the refrigerant flow rate necessary at the indoor unit
40 from information entered by the user via the inputter 402 and the water temperature
measured by the temperature sensor 403. Then, the control device 401 outputs information
presenting the obtained flow rate to the outdoor unit 20. Furthermore, the control
device 401 obtains the degree of opening of the expansion valve 42 based on instruction
from the control device 201 of the outdoor unit 20. Then, the control device 401 adjusts
the degree of opening of the expansion valve 42 via the valve drive circuit 404.
[0051] Operation of the heat pump system 10 having the above-described configuration will
be described hereafter. The heat pump system 10 operates as the control devices 301
and 401 of the indoor units 30A to 30C and 40 cooperate based on instruction from
the control device 201 of the outdoor unit 20. FIG. 5 is a flowchart showing a procedure
executed by the control device 201 after the outdoor unit 20 is powered on.
[0052] For using the heat pump system 10, the user can specify set temperatures T
i (n) of the indoor units 30A to 30C and 40 by operating the inputters 302 and 402
of the indoor units 30A to 30C and 40. When there is no input of set temperatures
from the user, the set temperatures T
i (n) are set to initial values. Furthermore, the user can specify priorities P (n)
for the indoor units 30A to 30C and 40 by operating the inputters 302 and 402 of the
indoor units 30A to 30C and 40. The set temperatures T
i (n) and priorities P (n) entered by the user are retrieved and stored by the control
devices 301 and 401.
[0053] As the heat pump system 10 starts operating, the control device 201 acquires priority
information PD (n) presenting the priorities P (n) from the control devices 301 and
401 of the indoor units 30A to 30C and 40 in the first Step S201. Here, n is determined
by the number of indoor units 30A to 30C and 40, and presents an integer from 1 to
4 in this case. The priority information PD (1) to PD (4) presents priority information
of the indoor units 30A to 30C and 40, respectively.
[0054] The priority P (n) presents a rank in priority of the indoor unit, which is presented
by three numbers 1 to 3 in this embodiment. The priority P (n) is higher in ranking
as the number is higher. For example, an indoor unit having a priority P (n) of "3"
has priority in supply of the refrigerant over an indoor unit having a priority P
(n) of "2" or "1." The user can enter a value of the priority P (n) into the control
devices 301 and 401 via, for example, the inputters 302 and 402 of the indoor units
30A to 30C and 40.
[0055] In the next Step S202, the control device 201 acquires requested quantity information
QD (n) presenting requested quantities Q (n) from the control devices 301 and 401
of the indoor units 30A to 30C and 40. In this embodiment, the requested quantity
information QD (1) to QD (4) presents requested quantity information of the indoor
units 30A to 30C and 40, respectively.
[0056] The requested quantity Q (n) is the refrigerant flow rate necessary at an indoor
unit that is obtained by the control devices 301 and 401 of the indoor units 30A to
30C and 40 as described above. For example, the requested quantity Q (n) is equivalent
to the quantity per minute (L/min) of refrigerant running through an indoor unit.
[0057] In the next Step S203, the control device 201 calculates the total requested quantity
QT (k) for each value k (k = 1 to 3) of the priorities P (n). The total requested
quantity QT (k) is, as presented by the expression (1) below, the sum of requested
quantities Q
k (n) from the indoor units having a priority P (n) of a value k.
[0058] For example, if the value k of the priority P (1) of the indoor unit 30A is "3,"
the value k of the priority P (2) of the indoor unit 30B is "2," the value k of the
priority P (3) of the indoor unit 30C is "2," and the value k of the priority P (4)
of the indoor unit 40 is "1," the control device 201 obtains Q
3 (1) as the total requested quantity QT (3) for the priority value of "3." Additionally,
the control device 201 obtains Q
2 (2) + Q
2 (3) as the total requested quantity QT (2) for the priority value of "2." Furthermore,
the control device 201 obtains Q
1 (4) as the total requested quantity QT (1) for the priority value of "1."
[0059] The following explanation will be made on the assumption that the value k of the
priority P (1) of the indoor unit 30A is "3," the value k of the priority P (2) of
the indoor unit 30B is "2," the value k of the priority P (3) of the indoor unit 30C
is "2," and the value k of the priority P (4) of the indoor unit 40 is "1."
[0060] In the next Step S204, the control device 201 compares the total requested quantity
QT (k1) for the highest priority value k1 with the maximum quantity (maximum flow
rate) QM per minute of the refrigerant discharged from the compressor 21. More specifically,
the control device 201 compares the total requested quantity QT (3) for the highest
priority value of "3" with the maximum quantity QM. Then, if the total requested quantity
QT (3) is larger than the maximum quantity QM (Step S2O4: Yes), the control device
201 proceeds to the next Step S205.
[0061] In the Step S205, as presented by the expression (2) below, the control device 201
divides the maximum quantity QM in proportion of the ratio of the requested quantities
Q
k1 (n) from the indoor units having a priority value k1 to calculate the distribution
quantities QS
k1 (n) to the indoor units having a priority P (n) of a value k1. Furthermore, the control
device 201 sets the distribution quantities QS
k (n) to the remaining units to zero.
[0062] In the Step S205, the priority value k1 is "3." Therefore, the distribution quantity
QS
3 (1) of the refrigerant to be distributed to the indoor unit 30A can be obtained by
substituting the requested quantity Q
3 (1) from the indoor unit 30A and the total requested quantity QT (3) for the priority
value k of "3" in the above expression (2). Here, in the Step S205, only one indoor
unit has the priority value k of "3." Therefore, the maximum quantity QM of the refrigerant
discharged from the compressor 21 and the distribution quantity QS
3 (1) to the indoor unit 30A are equal.
[0063] On the other hand, if the total requested quantity QT (k1) is equal to or smaller
than the maximum quantity QM in the Step S204 (Step S204: No), the control device
201 proceeds to the next Step S206.
[0064] In the Step S206, the control device 201 determines quantities equal to the requested
quantities Q
k1 (n) from the indoor units having a priority value k1 to be the distribution quantities
QS
k1 (n) to those indoor units. In the Step S206, a quantity equal to the requested quantity
Q
3 (1) from the indoor unit 30A having the priority value of "3" is the distribution
quantity QS
3 (1) to the indoor unit 30A.
[0065] In the next Step S207, the control device 201 compares the total requested quantity
QT (k2) for the second highest priority value k2 (= k1 - 1) with the remaining quantity
QM (k1) after the total requested refrigerant quantity QT (k1) already distributed
is subtracted from the maximum quantity QM. Then, if the total requested quantity
QT (k2) is larger than the remaining quantity QM (k1) (Step S207: Yes), the control
device 201 proceeds to the next Step S208.
[0066] In the Step S208, as presented by the expression (3) below, the control device 201
divides the remaining quantity QM (k1) in proportion of the ratio of the requested
quantities Q
k2 (n) from the indoor units having the priority value k2 to calculate the respective
distribution quantities QS
k2 (n) to those indoor units. Furthermore, the control device 201 sets the distribution
quantities QS
k (n) to the remaining indoor units to zero.
[0067] In the Step S208, the priority value k2 is "2." Therefore, the distribution quantity
QS
2 (2) of the refrigerant to be distributed to the indoor unit 30B can be obtained by
substituting the remaining quantity QM (k1), the requested quantity Q
2 (2) from the indoor unit 30B, and the total requested quantity QT (2) for the priority
value k of "2" in the above expression (3). Furthermore, the distribution quantity
QS
2 (3) of the refrigerant to be distributed to the indoor unit 30C can be obtained by
substituting the remaining quantity QM (2), the requested quantity Q
2 (3) from the indoor unit 30C, and the total requested quantity QT (2) for the priority
value k of "2" in the above expression (3).
[0068] For example, if the maximum quantity QM is "10," the requested quantity Q
3 (1) from the indoor unit 30A is "6," the requested quantity Q
2 (2) from the indoor unit 30B is "3," the requested quantity Q
2 (3) from the indoor unit 30B is "4," the total requested quantity QT (3) is "6."
Then, the remaining quantity QM (2) is "4 (= QM - QT (3))." Furthermore, the total
requested quantity QT (2) (= Q
2 (2) + Q
2 (3)) is "7."
[0069] Thus, the distribution quantity QS
2 (2) to the indoor unit 30B is "12/7" as a result of substituting "4" for the remaining
quantity QM (k1), "7" for the total requested quantity QT (k2), and "3" for Q
k2 (n) in the above expression (3). Similarly, the distribution quantity QS
2 (3) to the indoor unit 3C is "16/7" as a result of substituting the values.
[0070] Consequently, the distribution quantities QS
3 (1), QS
2 (2), and QS
2 (3) to the indoor units 30A, 30B, and 30C are obtained as shown in the table below.
[Table 2]
QS3 (1), |
QS2 (2), |
QS2 (3) |
6 |
12/7 |
16/7 |
[0071] On the other hand, if the total requested quantity QT (k2) is equal to or smaller
than the remaining quantity QM (k1) in the Step S207 (Step S207: No), the control
device 201 proceeds to the next Step S209.
[0072] In the Step S209, the control device 201 determines quantities equal to the requested
quantities Q
k2 (n) from the indoor units having a priority value k2 to be the distribution quantities
QS
k2 (n) to those indoor units. In the Step S209, a quantity equal to the requested quantity
Q
2 (2) from the indoor unit 30B having the priority value of "2" is the distribution
quantity QS
2 (2) to the indoor unit 30B. Furthermore, a quantity equal to the requested quantity
Q
2 (3) from the indoor unit 30C is the distribution quantity QS
2 (3) to the indoor unit 30C.
[0073] In the next Step S210, the control device 201 compares the total requested quantity
QT (k3) for the lowest priority value k3 (= k2 - 1) with the remaining quantity QM
(k2) after the total requested quantities QT (k1) and QT (k2) of the refrigerant already
distributed is subtracted from the maximum quantity QM. Then, if the total requested
quantity QT (k3) is larger than the remaining quantity QM (k2) (Step S210: Yes), the
control device 201 proceeds to the next Step S211.
[0074] In the Step S211, as presented by the expression (4) below, the control device 201
divides the remaining quantity QM (k2) in proportion of the ratio of the requested
quantities Q
k3 (n) from the indoor units having a priority value k3 to calculate the distribution
quantities QS
k3 (n) to those indoor units. Furthermore, the control device 201 sets the distribution
quantities QS
k (n) to the remaining indoor units to zero.
[0075] In the Step S211, the priority value k3 is "1." Therefore, the distribution quantity
QS
3 (4) of the refrigerant to be distributed to the indoor unit 40 can be obtained by
substituting the remaining quantity QM (k2), the requested quantity Q2
k3 (3) from the indoor unit 40, and the total requested quantity QT (1) for the priority
value k of "1" in the above expression (4).
[0076] For example, when the maximum quantity QM is "10," the requested quantity Q
3 (1) from the indoor unit 30A is "3," the requested quantity Q
2 (2) from the indoor unit 30B is "2," the requested quantity Q
2 (3) from the indoor unit 30B is "4," and the requested quantity Q
1 (4) from the indoor unit 40 is "7," the total requested quantity QT (3) is "3" and
the total requested quantity QT (2) is "6." Then, the remaining QM (1) is "1 (= QM
- QT (3) - QT (2)." Furthermore, the total requested quantity QT (1) (= Q
1 (4)) is "7."
[0077] Then, the distribution quantity QS
1 (4) to the indoor unit 40 is "1" as a result of substituting "1" for the remaining
quantity QM (k2), "7" for the total requested quantity QT (k3), and "7" for Q
k2 (n) in the above expression (4). Here, the remaining quantity QM (k2) is all distributed
to the indoor unit 40. Therefore, the remaining quantity QM (k2) and distribution
quantity QS
1 (4) are equal.
[0078] Consequently, the distribution quantities QS
3 (1), QS
2 (2), QS
2 (3), and QS
1 (4) to the indoor units 30A, 30B, 30C, and 40 are obtained as shown in the table
below.
[Table 3]
QS3 (1), |
QS2 (2), |
QS2 (3) |
QS1 (4) |
3 |
2 |
4 |
1 (= 7/7) |
[0079] On the other hand, if the total requested quantity QT (k3) is equal to or smaller
than the remaining quantity QM (k2) in the Step S210 (Step S210: No), the control
device 201 proceeds to the nest Step S212.
[0080] In the Step S212, the control device 201 determines quantities equal to the requested
quantities Q
k3 (n) from the indoor units having a priority value k3 to be the distribution quantities
QS
k3 (n) to those indoor units. In the Step S212, a quantity equal to the requested quantity
Q
1 (4) from the indoor unit 40 having the priority value of "1" is the distribution
quantity QS
1 (4) to the indoor unit 30B.
[0081] After completing the processing in the Step S205, S208, S211, or S212, the control
device 201 proceeds to Step S213.
[0082] In the Step S213, the control device 201 sets a drive voltage frequency f for driving
the compressor 21. When the determinations are affirmative in the Steps S204, S207,
and S210, the total of the requested quantities Q (n) from the indoor units 30A to
30C and 40 is larger than the maximum quantity QM of the refrigerant discharged from
the compressor 21. Therefore, if the determinations are affirmative in the Steps S204,
S207, and S210, the control device 201 sets the drive voltage frequency f to a frequency
equal to the rated frequency of the compressor 21. Consequently, the compressor 21
operates with the rated maximum output.
[0083] On the other hand, when the determinations are all negative in the Steps S204, S207,
and S210, the maximum quantity QM of the compressor 21 is larger than the total of
the requested quantities Q (n) from the indoor units 30A to 30C and 40. In such a
case, the control device 201 sets the drive voltage frequency f so that the compressor
21 discharges the refrigerant in a quantity equal to the sum of the requested quantities
Q (n) from the indoor units 30A to 30C and 40.
[0084] After setting the drive voltage frequency f, the control device 201 outputs information
presenting the frequency f to the drive device 202. Consequently, the drive device
202 applies the drive voltage of the frequency f to the compressor 21. At the compressor
21, the inverter motor constituting the compressor 21 rotates at a rotation speed
proportional to the frequency f. The compressor 21 discharges the refrigerant in a
quantity corresponding to the requests from the indoor units.
[0085] In the next Step S214, the control device 201 sets the degrees of opening R1 to R4
of the expansion valves 32 and 42 constituting the indoor units 30A to 30C and 40.
The degrees of opening R1 to R4 of the expansion valves 32 and 42 are set in accordance
with the distribution quantities QS
k (n) to the indoor units that are obtained in the processing of the Steps S201 to
S213.
[0086] For example, when the determination is affinitive in the Step S204, the total of
the distribution quantities QS
k1 (n) to the indoor units having a priority value k1 surpasses the maximum quantity
QM of the compressor 21. In such a case, the control device 201 sets the degrees of
opening of the expansion valves of the indoor units having the priority value k1 to
the degrees of opening corresponding to the requested quantities requested by those
indoor units. Then, the control device 201 sets the degrees of opening of the expansion
valves of the remaining indoor units to zero.
[0087] More specifically, the control device 201 sets the degree of opening R1 of the expansion
valve 32 of the indoor unit 30A in accordance with the requested quantity Q (1) and
sets the degrees of the opening R2 to R4 of the expansion valves 32 and 42 of the
remaining indoor units 30B, 30C, and 40 to zero.
[0088] After setting the degrees of opening of the expansion valves 32 and 42, the control
device 201 notifies the control devices 301 and 401 of the indoor units 30A to 30C
and 40 of the setting results. Consequently, the expansion valve 32 of the indoor
unit 30A is opened to a desired degree of opening and the expansion valves 32 and
42 of the indoor units 30B, 30C, and 40 are completely closed. Consequently, the indoor
unit 30A having the highest priority is supplied with the refrigerant corresponding
to the requested quantity.
[0089] When the determination is affirmative in the Step S207, the total of the distribution
quantities QS
k1 (n) to the indoor units having a priority value k1 and distribution quantities QS
k2 (n) to the indoor units having a priority value k2 surpasses the maximum quantity
QM of the compressor 21. In such a case, the control device 201 sets the degrees of
opening of the expansion valves of the indoor units having the priority values k1
and k2 to the degrees of opening corresponding to the requested quantities requested
by those indoor units. Then, the control device 201 sets the degrees of opening of
the expansion valves of the remaining indoor units to zero.
[0090] More specifically, the control device 201 sets the degrees of opening R1 to R3 of
the expansion valves 32 of the indoor units 30A, 30B, and 30C in accordance with the
requested quantities Q (1), Q (2), and Q (3) and sets the degree of opening R4 of
the expansion valve 42 of the remaining indoor unit 40 to zero.
[0091] After setting the degrees of opening of the expansion valves 32 and 42, the control
device 201 notifies the control devices 301 and 401 of the indoor units 30A to 30C
and 40 of the setting results. Consequently, the indoor units 30A to 30C are supplied
with the refrigerant corresponding to the requested quantities.
[0092] When the determination is affirmative in the Step S210, the total of the distribution
quantities QS
k1 (n) to the indoor units having a priority value k1, distribution quantities QS
k2 (n) to the indoor units having a priority value k2, and distribution quantities QS
k3 (n) to the indoor units having a priority value k3 surpasses the maximum quantity
QM of the compressor 21. In such a case, the control device 201 sets the degrees of
opening of the expansion valves of the indoor units having the priority values k1,
k2, and k3 to the degrees of opening corresponding to the requested quantities requested
by those indoor units. Then, the control device 201 sets the degrees of opening of
the expansion valves of the remaining indoor units to zero.
[0093] More specifically, the control device 201 sets the degrees of opening R1 to R4 of
the expansion valves 32 and 42 of the indoor units 30A, 30B, 30C, and 40 in accordance
with the requested quantities Q (1), Q (2), Q (3), and Q (4). In the above-described
case, there is no remaining unit. However, if there are any units other than the indoor
units 30A to 30C and 40, the control device 201 sets the degrees of opening of the
expansion valves of those remaining units to zero.
[0094] After setting the degrees of opening of the expansion valves 32 and 42, the control
device 201 notifies the control devices 301 and 401 of the indoor units 30A to 30C
and 40 of the setting results. Consequently, the indoor units 30A to 30C and 40 are
supplied with the refrigerant corresponding to the requested quantities.
[0095] On the other hand, when the determination is negative in the Step S210, the total
of the distribution quantities QS
k1 (n) to the indoor units having a priority value k1, distribution quantities QS
k2 (n) to the indoor units having a priority value k2, and distribution quantities QS
k3 (n) to the indoor units having a priority value k3 is equal to or smaller than the
maximum quantity QM of the compressor 21. In such a case, the control device 201 sets
the degrees of opening of the expansion valves of the indoor units having the priority
values k1, k2, and k3 to the degrees of opening corresponding to the requested quantities
requested by those indoor units.
[0096] More specifically, the control device 201 sets the degrees of opening R1 to R4 of
the expansion valves 32 and 42 of the indoor units 30A, 30B, 30C, and 40 in accordance
with the requested quantities Q (1), Q (2), Q (3), and Q (4).
[0097] After setting the degrees of opening of the expansion valves 32 and 42, the control
device 201 notifies the control devices 301 and 401 of the indoor units 30A to 30C
and 40 of the setting results. Consequently, the indoor units 30A to 30C and 40 are
supplied with the refrigerant corresponding to the requested quantities.
[0098] As described above, in this embodiment, the refrigerant discharged from the compressor
21 is distributed based on the priorities set by the user in advance and the remaining
refrigerant is further distributed based on the priorities. Therefore, setting the
priorities for the indoor units 30A to 30B and 40 in accordance with, for example,
the usage of the work spaces A1 to A3 and kitchen B1 in the office building 100, the
user can operate the heat pump system 10 efficiently in accordance with the intended
use.
[0099] More specifically, setting the priorities for the work spaces in accordance with
the frequency of use or importance, the user can operate the indoor unit of a work
space requiring a high air-conditioning workload at the rated capacity even if the
total of the maximum cooling capacities of the indoor units surpasses the maximum
cooling capacity of the outdoor unit. Furthermore, the indoor unit of a work space
where the air conditioning is highly necessary can be operated at the rated capacity.
Consequently, it is assured that the work space is comfortable.
[0100] Furthermore, the remaining capacity of the outdoor unit is distributed to the remaining
indoor units according to their priorities. The indoor units can be operated efficiently
within the range of the cooling capacity of the outdoor unit.
[0101] In the above embodiment, the heat pump system 10 comprises three indoor units 30A
to 30C conducting heat exchange between the refrigerant and indoor air and one indoor
unit 40 conducting heat exchange between the refrigerant and tap water. This is not
restrictive. The heat pump system 10 can comprise four or more indoor units conducting
heat exchange between the refrigerant and indoor air. Furthermore, the heat pump system
10 can comprise multiple indoor units conducting heat exchange between the refrigerant
and tap water.
[0102] In the above embodiment, three levels of priority are set for the indoor units. This
is not restrictive. Two levels of priority can be set for the indoor units. In such
a case, the Steps S209 to S211 in FIG. 5 are eliminated.
[0103] Alternatively, when four or more levels of priority are set for the indoor units,
a series of processing corresponding to the Steps S206 to S208 or to the Steps S209
to S211 is executed before the processing of Step S212 to calculate the distribution
quantities in accordance with the priorities.
«Embodiment 2»
[0104] Embodiment 2 of the present invention will be described hereafter with reference
to the drawings. Here, the components that are the same as or equivalent to those
in Embodiment 1 are referred to by the equivalent reference numbers. FIG. 6 is a diagram
showing a heat pump system 11 according to Embodiment 2. As shown in FIG. 6, the heat
pump system 11 is different from the heat pump system 10 according to Embodiment 1
in that the indoor unit 40 has a secondary refrigerating cycle.
[0105] As shown in FIG. 6, the indoor unit 40 comprises heat exchangers 41 and 51, a compressor
52, and expansion valves 42 and 53. The heat exchangers 41 and 51, expansion valve
53, and compressor 52 are connected in series by a refrigerant pipe 57, constituting
the secondary refrigerating cycle. The heat pump system 11 overall comprises a two-tier
cascade refrigerating cycle. Here, for example, chlorofluorocarbon R134a having a
high critical temperature is used as the refrigerant for the secondary refrigerating
cycle
[0106] In the secondary refrigerating cycle having the above configuration, the heat exchanger
41 functions as the vaporization heat source of the secondary refrigerating cycle
while the primary refrigerating cycle constituted by the outdoor unit 20, circulating
system 50, and heat exchanger 41 of the indoor unit 40 is used in heating operation.
The refrigerant circulating the refrigerant pipe 57 is heated to the condensation
temperature after passing through the heat exchanger 41. In the heat exchanger 51,
heat exchange occurs between the refrigerant heated to the condensation temperature
and the tap water circulating a water pipe 61. Thus, the tap water is heated to hot
water.
[0107] FIG. 7 is a block diagram of the indoor unit 40 constituting the heat pump system
11. As shown in FIG. 7, the indoor unit 40 comprises a drive device 405 driving the
compressor 52, a pressure sensor 406 detecting the pressure of the refrigerant entering
the compressor 52, and a pressure sensor 407 detecting the pressure of the refrigerant
leaving the compressor 52.
[0108] The drive device 405 has a configuration equivalent to the drive device 202 described
in Embodiment 1. The drive device 405 drives the compressor 52 based on instruction
from the control device 401.
[0109] In this embodiment, the control device 401 monitors the temperature of the tap water
after heat exchange with the refrigerant in the heat exchanger 51 using a temperature
sensor 403. Then, the control device 401 controls the output of the compressor 52
and the degree of opening of the expansion valve 53 so that the temperature of the
tap water reaches a desired temperature. The compressor 52 is controlled by, for example,
changing the frequency f of the drive voltage applied to the compressor 52.
[0110] For heating the tap water to a desired temperature, the refrigerant in a quantity
corresponding to the heat quantity should be supplied from the outdoor unit 20 to
the heat exchanger 41 of the indoor unit 40. The heat quantity HQ1 the heat exchanger
41 needs can be obtained by, as presented by the expression (5) below, subtracting
the input W of the compressor 52 from the heat quantity HQ2 used by the indoor unit
40 for supplying hot water.
[0111] Using the coefficient of performance COP of the secondary refrigerating cycle, the
above expression (5) can be rewritten as follows.
[0112] The coefficient of performance COP is presented by the expression (7) below in which
ET is the temperature of the refrigerant entering the compressor 52 (the primary temperature)
(°C), CT is the temperature of the refrigerant discharged from the compressor 52 (the
secondary temperature) (°C), and η is the efficiency of the compressor 52.
[0113] The efficiency η of the compressor 52 is constant and approximately 0.6. Then, the
heat quantity HQ1 the heat exchanger 41 needs can be obtained from, as presented by
the expression (8) below, the heat quantity HQ2 used by the indoor unit 40 for supplying
hot water and the primary temperature ET and secondary temperature CT of the compressor
52.
[0114] Then, the control device 401 obtains the primary temperature ET based on the output
from the pressure sensor 406 and the secondary temperature CT based on the output
from the pressure sensor 407. Subsequently, the control device 401 substitutes the
calculated temperatures ET and CT and the heat quantity HQ2 used by the indoor unit
40 for supplying hot water in the above expression (8) to obtain the heat quantity
HQ1 the heat exchanger 41 needs. Then, the control device 401 notifies the control
device 201 of a requested quantity Q (n) on the refrigerant of the primary refrigerating
cycle that is defined by the obtained heat quantity HQ1 in response to request from
the control device 201 of the outdoor unit 20.
[0115] Thus, the control device 201 supplies a desired requested quantity Q (n) of refrigerant
to the indoor unit 40.
[0116] As described above, in this embodiment, the primary temperature ET and secondary
temperature CT of the compressor 52 are monitored to obtain the heat quantity HQ1
the heat exchanger 41 needs on a real time basis, and then obtain a requested quantity
Q (n) on the refrigerant of the primary refrigerating cycle that is defined by the
heat quantity HQ1. Thus, the heat quantity to request for the first refrigerating
cycle can be obtained without calculating input to the compressor 52 even if the operation
state of the secondary refrigerating cycle of the indoor unit 40 changes. Then, the
refrigerant distributed by the outdoor unit 20 can be adjusted according to the operation
state.
[0117] Consequently, it is possible to reduce the loss caused by the refrigerant being excessively
supplied from the outdoor unit 20 to the indoor unit 40 and, for example, the compressor
being repeatedly started and stopped. Then, it is possible to reduce the energy consumption
of the system and operate the system efficiently.
[0118] In the above embodiment, the heat quantity to request for the first refrigerating
cycle is obtained based on the output from the pressure sensors 406 and 407. However,
as presented by the expression (5), if the input to the compressor 52 is known, the
heat quantity to request for the first refrigerating cycle can be obtained. Then,
it is possible to calculate the input to the compressor 52 and obtain the heat quantity
to request for the first refrigerating cycle using the measurement results. Also in
such a case, it is possible to adjust the refrigerant distributed by the outdoor unit
20 according to the operation state.
[0119] Consequently, it is possible to reduce the loss caused by the refrigerant being excessively
supplied from the outdoor unit 20 to the indoor unit 40 and, for example, the compressor
being repeatedly started and stopped. Then, it is possible to reduce the energy consumption
of the system and operate the system efficiently.
[0120] Embodiments of the present invention are described above. However, the present invention
is not confined to the above embodiments. For example, in the above embodiments, the
heat exchanger 23 of the outdoor unit 20 has a fixed capability. This is not restrictive.
Some procedure to improve the cooling efficiency of the refrigerant may be implemented
when the total of the requested quantities Q from the indoor units surpasses the maximum
quantity QM of the refrigerant discharged from the compressor 21. As such a procedure,
it is possible to improve the heat conductance expressed by the product of the heat
transfer area and heat transfer rate at the outdoor unit and indoor units. More specifically,
it is possible to increase the output of the fans of the heat exchangers of the units.
[0121] For example, FIG. 8 is an illustration showing an exemplary procedure executed by
the control device 201 of the outdoor unit 20. As the heat pump system 10 is activated,
the outdoor unit 20 compares the total quantity ∑Q of the requested refrigerant quantities
Q from the indoor units 30A to 30C and 40 with the maximum quantity QM of the compressor
21 (Step S301). If the total quantity ∑Q is equal to or smaller than the maximum quantity
QM of the compressor 21 (Step S302: Yes), the control device 201 operates the fan
of the heat exchanger 23 at a rotation speed N1. On the other hand, if the total quantity
∑Q is larger than the maximum quantity QM of the compressor 21 (Step S302: No), the
control device 201 operates the fan of the heat exchanger 23 at a rotation speed N2
that is higher than the rotation speed N1.
[0122] In this way, when the total quantity ∑Q of the requested refrigerant quantities Q
surpasses the maximum quantity QM of the compressor 21, the output of the outdoor
unit 20 is increased compared with before.
[0123] In the above embodiments, chlorofluorocarbon R410A is used as the refrigerant circulating
the primary refrigerating cycle and chlorofluorocarbon R134a is used as the refrigerant
circulating the secondary refrigerating cycle. This is not restrictive and, for example,
natural refrigerants such as carbon dioxide (CO
2), hydrocarbon, and helium, chlorine-free refrigerants such as R407C, R404A, HF01234yf,
and HF01234ze, or fluorocarbon refrigerants such as R22 used in existing products
can be used.
[0124] Furthermore, the refrigerant used in the primary refrigerating system and the refrigerant
used in the secondary refrigerating system can be of the same kind or of different
kinds. The refrigerants of the primary refrigerating cycle and secondary refrigerating
cycle do not mix with each other during heat exchange.
[0125] When a refrigerant having a low critical temperature is used as the refrigerant of
the secondary refrigerating cycle, the refrigerant of the secondary refrigerating
cycle may reach a supercritical state during heat exchange in the heat exchanger 51.
However, generally, when a refrigerant that is releasing heat is in a supercritical
state, change in the heat exchanger pressure and heat exchanger exit temperature causes
the COP to fluctuate more. Therefore, more advanced control is required in order to
operate at a higher COP. On the other hand, a refrigerant having a low critical temperature
generally has a high saturated pressure. Therefore, the pipes and compressors must
be made stronger, causing the device cost to increase.
[0126] Furthermore, in order to prevent proliferation of bacteria such as Legionella in
the tap water, it is recommended that the temperature of hot water to supply is 60
°C or higher. Then, it is desirable that the target temperature of hot water to supply
is at least 60°C or higher. In consideration of this matter, it is desirable that
the refrigerant of the secondary refrigerating cycle is a refrigerant having a critical
temperature of 60 °C or higher. Using such a refrigerant as the refrigerant of the
secondary refrigerating cycle, presumably, a stably high COP can be obtained at low
cost.
[0127] The functions of the outdoor control unit 120 and indoor control units 130A to 130C
and 140 according to the above embodiments can be realized by dedicated hardware or
a conventional computer system.
[0128] The programs stored in the auxiliary storage 201c of the control device 201 in the
above embodiments can be stored and distributed on a computer-readable recording medium
such as a flexible disc, CD-ROM (compact disk read-only memory), DVD (digital versatile
disk, and MO (magneto-optical disk), and installed on a computer or the like to configure
a device executing the above-described procedures. Furthermore, the programs can be
stored in a disc device or the like of a given server unit on a communication network
such as the Internet and, for example, superimposed on a carrier wave and downloaded.
[0129] In the above embodiments, the control device 201 of the outdoor unit 20 executes
the series of processing shown in FIG. 5. This is not restrictive. It is possible
to use an independent control device shared by the outdoor unit and indoor units to
control the compressor 21 and four-way valve 22 of the outdoor unit 20 and to control
the expansion valves 32, 42, and 53 of the indoor units 30A to 30C and 40. Furthermore,
the processing executed by the control device 201 of the outdoor unit 20 can be executed
by the control devices 301 and 401 of the indoor units 30A to 30C and 40.
[0130] The above-described embodiments are given for explaining the present invention and
do not confine the scope of the present invention. In other words, the scope of the
present invention is set forth by the scope of claims, not by the above-described
embodiments. Various modifications made within the scope of claims are considered
to fall under the scope of the present invention.
Industrial Applicability
[0131] The heat pump system, control device, temperature adjustment method, and program
of the present invention are suitable for adjusting the temperature of a temperature
adjustment target.
Reference Signs List
[0132]
- 10, 11
- Heat pump system
- 20
- Outdoor unit
- 21
- Compressor
- 22
- Four-way valve
- 23
- Heat exchanger
- 24, 25
- Joint
- 26
- Refrigerant pipe
- 30A to 30C
- Indoor unit
- 31
- Heat exchanger
- 32
- Expansion valve
- 33
- Joint
- 34
- Joint
- 35
- Refrigerant pipe
- 40
- Indoor unit
- 41, 51
- Heat exchanger
- 42, 53
- Expansion valve
- 43, 44
- Joint
- 47
- Refrigerant pipe
- 50
- Circulating system
- 50a, 50b
- Refrigerant pipe
- 52
- Compressor
- 57
- Refrigerant pipe
- 60
- Water supply pump
- 61
- Water pipe
- 100
- Office building
- 120
- Outdoor control unit
- 130A to 130C, 140
- Indoor control unit
- 201
- Control device
- 201a
- CPU
- 201b
- Main storage
- 201c
- Auxiliary storage
- 201d
- Interface
- 201e
- Bus
- 202
- Drive device
- 301
- Control device
- 302
- Inputter
- 303
- Temperature sensor
- 304
- Valve drive circuit
- 401
- Control device
- 402
- Inputter
- 403
- Temperature sensor
- 404
- Valve drive circuit
- 405
- Drive device
- 406, 407
- Pressure sensor
- A1 to A3
- Work space
- B1
- Kitchen
- R1 to R4
- Degree of opening
1. A heat pump system (10, 11): including indoor units (30A to 30C, 40) conducting heat
exchange between indoor air and a refrigerant, and an outdoor unit (20) conducting
heat exchange between outdoor air and the refrigerant, wherein the heat pump system
further comprises:
a first circulating system (50a, 50b) circulating the refrigerant between the indoor
units (30A to 30C, 40) and the outdoor unit (20);
adjustment means (32, 42) provided to each of the indoor units (30A to 30C, 40) for
adjusting the flow rate of the refrigerant entering the indoor unit (30A to 30C, 40)
from the first circulating system (50a, 50b);
input means (302, 402) for entering priorities set for the indoor units (30A to 30C,
40); and
control means (301, 401), characterized by the control means (301, 401) being configured to acquire priorities set in the indoor
units (30A to 30C, 40), to control the adjustment means (32, 42), and to distribute
the refrigerant so as to supply the indoor units (30A to 30C, 40) with the refrigerant
at the flow rates the indoor units (30A to 30C, 40) need in an order of the indoor
units (30A to 30C, 40) from the highest set priority of the acquired priorities when
the total of the refrigerant flow rates necessary at the indoor units (30A to 30C,
40), that are obtained from target temperatures of the indoor air of the indoor units
(30A 30C, 40) and the current temperatures of the indoor air, surpasses the refrigerant
flow rate that can be discharged into the first circulating system (50a, 50b) from
the outdoor unit (20).
2. The heat pump system (10, 11) according to claim 1, characterized in that the control means (301, 401) distributes the refrigerant in accordance with the ratio
of the refrigerant flow rates requested by the indoor units (30A to 30C, 40).
3. The heat pump system (10, 11) according to claim 1 or 2, characterized in that
the control means (301, 401) controls the adjustment means (32, 42) so that the indoor
units (30A to 30C, 40) having the highest set priority are supplied with the refrigerant
at the flow rates requested by those indoor units (30A to 30C, 40).
4. The heat pump system (10, 11) according to claim 3, characterized in that
the control means (301, 401) distributes the remaining refrigerant after supplying
the indoor units (30A to 30C, 40) having the highest set priority with the refrigerant
at the flow rates requested by those indoor units (30A to 30C, 40) to the other indoor
units (30A to 30C, 40).
5. The heat pump system (10, 11) according to claim 4, characterized in that the remaining refrigerant is distributed in accordance with the ratio requested by
the other indoor units (30A to 30C, 40).
6. The heat pump system (10, 11) according to any one of claims 1 to 5, characterized in that
the first circulating system (50a, 50b) increases the heat quantity of refrigerant
discharged from the outdoor unit (20) when the total of the refrigerant flow rates
requested by the indoor units (30A to 30C, 40) surpasses the maximum flow rate of
the refrigerant discharged from the outdoor unit (20) compared with when the total
of the refrigerant flow rates requested by the indoor units (30A to 30C, 40) is equal
to or lower than the maximum flow rate of refrigerant discharged from the outdoor
unit (20).
7. The heat pump system (10, 11) according to any one of claims 1 to 6, characterized in that
the indoor units (30A to 30C, 40) comprise;
a second circulating system (57) circulating a refrigerant undergoing heat exchange
with the refrigerant circulating the first circulating system (50a, 50b);
a compressor (52) circulating the refrigerant of the second circulating system (57);
first heat exchange means (41) conducting heat exchange between the refrigerant of
the first circulating system (50a, 50b) and the refrigerant of the second circulating
system (57) to function as the vaporization heat source of the second circulating
system (57); and
calculation means (301, 401) obtaining a heat quantity necessary at the first heat
exchange means (41) based on a primary temperature of the refrigerant entering the
compressor (52) and a secondary temperature of the refrigerant discharged from the
compressor (52), and calculating a requested heat quantity, defined from the obtained
heat quantity, for the outdoor unit (20).
8. The heat pump system (10, 11) according to claim 7, characterized in that
the calculation means (301, 401) obtains the primary temperature based on pressure
of the refrigerant entering the compressor (52) and obtains the secondary temperature
based on pressure of the refrigerant discharged from the compressor (52).
9. The heat pump system (10, 11) according to claim 7, characterized in that the calculation means (301, 401) obtains the heat quantity necessary at the first
heat exchange means (41) the coefficient of performance obtained based on the primary
temperature, the secondary temperature, and an efficiency of the compressor (52).
10. The heat pump system (10, 11) according to any one of claims 7 to 9, characterized in that
the indoor units (30A to 30C, 40) comprise second heat exchange means (51) conducting
heat exchange between the refrigerant circulating the second circulating system (57)
and the water running through a hot-water supply system (61),
wherein the refrigerant circulating the second circulating system (57) has a critical
temperature of 60°C or higher.
11. A temperature adjustment method, characterized by comprising;
a step of obtaining the refrigerant flow rates necessary at indoor units (30A to 30C,
40) that are obtained from target temperatures of indoor air of the indoor units (30A
to 30C, 40) and the current temperatures of the indoor air;
a step of calculating the total quantity of the refrigerant flow rates necessary at
the indoor units (30A to 30C, 40); and
a step of acquiring priorities set in the indoor units (30A to 30C, 40) and distributing
the refrigerant to the indoor units (30A to 30C, 40) so as to supply the indoor units
(30A to 30C, 40) with the refrigerant at the flow rates the indoor units (30A to 30C,
40) need in an order of the indoor units (30A to 30C, 40) from the highest set priority
of the acquired priorities when the total quantity surpasses the refrigerant quantity
supplied to the indoor units (30A to 30C, 40) from an outdoor unit (20).
12. A program allowing a computer to execute;
a procedure to obtain the refrigerant flow rates necessary at indoor units (30A to
30C, 40) that are obtained from target temperatures of indoor air of the indoor units
(30A to 30C, 40) and the current temperatures of the indoor air;
a procedure to calculate the total quantity of the refrigerant flow rates necessary
at the indoor units (30A to 30C, 40); and
a procedure to acquire priorities set in the indoor units and to control distribution
means of the indoor units (30A to 30C, 40) so as to supply the indoor units with the
refrigerant at the flow rates the indoor units (30A to 30C, 40) need in an order of
the indoor units (30A to 30C, 40) from the highest set priority of the acquired priorities
when the total quantity surpasses the refrigerant quantity supplied to the indoor
units (30A to 30C, 40) from an outdoor unit (20).
1. Wärmepumpensystem (10, 11): aufweisend Inneneinheiten (30A bis 30C, 40), durchführend
Wärmeaustausch zwischen Innenraumluft und einem Kältemittel, und eine Außeneinheit
(20), durchführend Wärmeaustausch zwischen Außenluft und dem Kältemittel, wobei das
Wärmepumpensystem ferner umfasst:
ein erstes Zirkulationssystem (50a, 50b), zirkulierend das Kältemittel zwischen den
Inneneinheiten (30A bis 30C, 40) und der Außeneinheit (20);
ein Anpassungsmittel (32, 42), die für jede der Inneneinheiten (30A bis 30C, 40) vorgesehen
sind, zum Anpassen der Strömungsrate des Kältemittels, eintretend aus dem ersten Zirkulationssystem
(50a, 50b) in die Inneneinheit (30A bis 30C, 40);
ein Eingabemittel (302, 402) zum Eingeben von Prioritäten, die für die Inneneinheiten
(30A bis 30C, 40) festgelegt werden; und
ein Steuermittel (301, 401), dadurch gekennzeichnet, dass das Steuermittel (301, 401) ferner eingerichtet ist, die in den Inneneinheiten (30A
bis 30C, 40) festgelegten Prioritäten zu erwerben, das Anpassungsmittel (32, 42) zu
steuern und das Kältemittel zu verteilen, um die Inneneinheiten (30A bis 30C, 40)
mit dem Kältemittel mit den Strömungsraten, die die Inneneinheiten (30A bis 30C, 40)
benötigen, zu versorgen in einer Reihenfolge der Inneneinheiten (30A bis 30C, 40)
von der höchsten festgelegten Priorität der erworbenen Prioritäten, wenn der Gesamtbetrag
der an den Inneneinheiten (30A bis 30C, 40) erforderlichen Kältemittelströmungsraten,
die aus Zieltemperaturen der Innenraumluft der Inneneinheiten (30A bis 30C, 40) und
den aktuellen Temperaturen der Innenraumluft erhalten werden, die Kältemittelströmungsrate,
die von der Außeneinheit (20) in das erste Zirkulationssystem (50a, 50b) abgegeben
werden kann, überschreitet.
2. Wärmepumpensystem (10, 11) nach Anspruch 1, dadurch gekennzeichnet, dass
das Steuermittel (301, 401) das Kältemittel gemäß dem Verhältnis der von den Inneneinheiten
(30A bis 30C, 40) angeforderten Kältemittelströmungsraten verteilen.
3. Wärmepumpensystem (10, 11) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass
das Steuermittel (301, 401) das Anpassungsmittel (32, 42) steuert, so dass die Inneneinheiten
(30A bis 30C, 40), aufweisend die höchste festgelegte Priorität, mit dem Kältemittel
mit den von den Inneneinheiten (30A bis 30C, 40) angeforderten Strömungsraten versorgt
werden.
4. Wärmepumpensystem (10, 11) nach Anspruch 3, dadurch gekennzeichnet, dass das Steuerungsmittel (301, 401) das verbleibende Kältemittel, nachdem die Inneneinheiten
(30A bis 30C, 40), aufweisend die höchste festgelegte Priorität, mit dem Kältemittel
mit den von den Inneneinheiten (30A bis 30C, 40) angeforderten Strömungsraten versorgt
wurden, an die andere Inneneinheiten (30A bis 30C, 40) verteilt.
5. Wärmepumpensystem (10, 11) nach Anspruch 4, dadurch gekennzeichnet, dass
das verbleibende Kältemittel gemäß dem von den anderen Inneneinheiten (30A, 30C, 40)
geforderten Verhältnis verteilt wird.
6. Wärmepumpensystem (10, 11) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass
das erste Zirkulationssystem (50a, 50b) die Wärmemenge des Kältemittels, das aus der
Außeneinheit (20) abgegeben wird, erhöht, wenn der Gesamtbetrag der von den Inneneinheiten
(30A bis 30C, 40) angeforderten Kältemittelströmungsraten die maximale Strömungsrate
des aus der Außeneinheit (20) abgegebenen Kältemittels im Vergleich zu dem Fall, wenn
der Gesamtbetrag der von den Inneneinheiten (30A bis 30C, 40) angeforderten Kältemittelströmungsraten
gleich ist wie oder kleiner ist als die maximale Strömungsrate des aus der Außeneinheit
(20) abgegebenen Kältemittels, überschreitet.
7. Wärmepumpensystem (10, 11) nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass
die Inneneinheiten (30A bis 30C, 40) umfassen:
ein zweites Zirkulationssystem (57), zirkulierend ein Kältemittel, das Wärmeaustausch
mit dem im ersten Zirkulationssystem (50a, 50b) zirkulierenden Kältemittel unterzogen
wird;
einen Verdichter (52), zirkulierend das Kältemittel des zweiten Zirkulationssystems
(57);
eine erstes Wärmeaustauschmittel (41), durchführend Wärmeaustausch zwischen dem Kältemittel
des ersten Zirkulationssystems (50a, 50b) und dem Kältemittel des zweiten Zirkulationssystems
(57), um als die Verdampfungswärmequelle des zweiten Zirkulationssystems (57) zu wirken;
und
ein Berechnungsmittel (301, 401), erhaltend eine Wärmemenge, die an dem ersten Wärmeaustauschmittel
(41) erforderlich ist, basierend auf einer Primärtemperatur des in den Verdichter
(52) eintretenden Kältemittels und einer Sekundärtemperatur des aus dem Verdichter
(52) abgegebenen Kältemittels, und berechnend eine angeforderte Wärmemenge, die aus
der erhaltenen Wärmemenge definiert ist, für die Außeneinheit (20).
8. Wärmepumpensystem (10, 11) nach Anspruch 7, dadurch gekennzeichnet, dass
das Berechnungsmittel (301, 401) die Primärtemperatur erhält basierend auf dem Druck
des in den Verdichter (52) eintretenden Kältemittels und die Sekundärtemperatur erhält
basierend auf dem Druck des aus dem Verdichter (52) abgegebenen Kältemittels.
9. Wärmepumpensystem (10, 11) nach Anspruch 7, dadurch gekennzeichnet, dass
das Berechnungsmittel (301, 401) die Wärmemenge erhält, die an dem ersten Wärmeaustauschmittel
(41) erforderlich ist, wobei der Koeffizient der Leistung erhalten wird basierend
auf der Primärtemperatur, der Sekundärtemperatur und einem Wirkungsgrad des Verdichters
(52).
10. Wärmepumpensystem (10, 11) nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass
die Inneneinheiten (30A bis 30C, 40) ein zweites Wärmeaustauschmittel (51) umfassen,
durchführend Wärmeaustausch zwischen dem Kältemittel, zirkulierend im zweiten Zirkulationssystem
(57), und dem Wasser, das ein Warmwasser-Versorgungssystem (61) durchläuft,
wobei das Kältemittel, zirkulierend im zweiten Zirkulationssystem (57), eine kritische
Temperatur von 60°C oder höher aufweist.
11. Temperaturanpassungsverfahren,
dadurch gekennzeichnet, dass es umfasst:
einen Schritt des Erhaltens der an den Inneneinheiten (30A bis 30C, 40) erforderlichen
Strömungsraten, die aus Zieltemperaturen der Innenraumluft der Inneneinheiten (30A
bis 30C, 40) und den aktuellen Temperaturen der Innenraumluft erhalten werden;
einen Schritt des Berechnens der Gesamtmenge der an den Inneneinheiten (30A bis 30C,
40) erforderlichen Kältemittelströmungsraten; und
einen Schritt des Erwerbens von Prioritäten, die in den Inneneinheiten (30A bis 30C,
40) festgelegt sind, und Verteilens des Kältemittels an die Inneneinheiten (30A bis
30C, 40), um die Inneneinheiten (30A bis 30C, 40) mit dem Kältemittel mit den Strömungsraten,
die die Inneneinheiten (30A bis 30C, 40) benötigen, zu versorgen in einer Reihenfolge
der Inneneinheiten (30A bis 30C, 40) von der höchsten festgelegten Priorität der erworbenen
Prioritäten, wenn der Gesamtbetrag die den Inneneinheiten (30A bis 30C, 40) von einer
Außeneinheit (20) zugeführte Kältemittelmenge überschreitet.
12. Programm, das es einem Computer ermöglicht, auszuführen:
einen Vorgang zum Erhalten der an den Inneneinheiten (30A bis 30C, 40) erforderlichen
Kältemittelströmungsraten, die aus Zieltemperaturen der Innenraumluft der Inneneinheiten
(30A bis 30C, 40) und den aktuellen Temperaturen der Innenraumluft erhalten werden;
einen Vorgang zum Berechnen der Gesamtmenge der an den Inneneinheiten (30A bis 30C,
40) erforderlichen Kältemittelströmungsraten; und
ein Verfahren zum Erwerben der in den Inneneinheiten festgelegten Prioritäten und
zum Steuern des Verteilungsmittels der Inneneinheiten (30A bis 30C, 40), um die Inneneinheiten
mit dem Kältemittel mit den Strömungsraten, die die Inneneinheiten (30A bis 30C, 40)
benötigen, zu versorgen in einer Reihenfolge der Inneneinheiten (30A bis 30C, 40)
von der höchsten festgelegten Priorität der erworbenen Prioritäten, wenn der Gesamtbetrag
die den Inneneinheiten (30A bis 30C, 40) von einer Außeneinheit (20) zugeführte Kältemittelmenge
überschreitet.
1. Système de pompe à chaleur (10, 11) : comprenant des unités intérieures (30A à 30C,
40) effectuant un échange de chaleur entre l'air intérieur et un fluide frigorigène,
et une unité extérieure (20) effectuant un échange de chaleur entre l'air extérieur
et le fluide frigorigène, dans lequel le système de pompe à chaleur comprend en outre
:
un premier système de circulation (50a, 50b) faisant circuler le fluide frigorigène
entre les unités intérieures (30A à 30C, 40) et l'unité extérieure (20) ;
des moyens d'ajustement (32, 42) prévus pour chacune des unités intérieures (30A à
30C, 40) pour ajuster le débit du fluide frigorigène entrant dans l'unité intérieure
(30A à 30C, 40) à partir du premier système de circulation (50a, 50b) ;
des moyens d'entrée (302, 402) pour entrer des priorités établies pour les unités
intérieures (30A à 30C, 40) ; et
des moyens de commande (301, 401), caractérisé en ce que les moyens de commande (301, 401) sont configurés pour acquérir les priorités établies
dans les unités intérieures (30A à 30C, 40), pour commander les moyens d'ajustement
(32, 42), et pour distribuer le fluide frigorigène de manière à fournir aux unités
intérieures (30A à 30C, 40) le fluide frigorigène aux débits nécessaires aux unités
intérieures (30A à 30C, 40) dans un ordre des unités intérieures (30A à 30C, 40) à
partir de la priorité établie la plus élevée des priorités acquises lorsque le total
des débits de fluide frigorigène nécessaires au niveau des unités intérieures (30A
à 30C, 40), qui sont obtenus à partir des températures cibles de l'air intérieur des
unités intérieures (30A à 30C, 40) et des températures actuelles de l'air intérieur,
dépasse le débit de fluide frigorigène qui peut être refoulé dans le premier système
de circulation (50a, 50b) à partir de l'unité extérieure (20).
2. Système de pompe à chaleur (10, 11) selon la revendication 1, caractérisé en ce que
les moyens de commande (301, 401) distribuent le fluide frigorigène conformément au
rapport des débits de fluide frigorigène demandés par les unités intérieures (30A
à 30C, 40).
3. Système de pompe à chaleur (10, 11) selon la revendication 1 ou 2, caractérisé en ce que
les moyens de commande (301, 401) commandent les moyens d'ajustement (32, 42) de sorte
que les unités intérieures (30A à 30C, 40) ayant la priorité établie la plus élevée
reçoivent le fluide frigorigène aux débits demandés par ces unités intérieures (30A
à 30C, 40).
4. Système de pompe à chaleur (10, 11) selon la revendication 3, caractérisé en ce que
les moyens de commande (301, 401) distribuent le fluide frigorigène restant après
avoir fourni aux unités intérieures (30A à 30C, 40) ayant la priorité établie la plus
élevée le fluide frigorigène aux débits demandés par ces unités intérieures (30A à
30C, 40) aux autres unités intérieures (30A à 30C, 40).
5. Système de pompe à chaleur (10, 11) selon la revendication 4, caractérisé en ce que
le fluide frigorigène restant est distribué conformément au rapport demandé par les
autres unités intérieures (30A à 30C, 40).
6. Système de pompe à chaleur (10, 11) selon l'une quelconque des revendications 1 à
5, caractérisé en ce que
le premier système de circulation (50a, 50b) augmente la quantité de chaleur du fluide
frigorigène refoulé de l'unité extérieure (20) lorsque le total des débits de fluide
frigorigène demandés par les unités intérieures (30A à 30C, 40) dépasse le débit maximum
du fluide frigorigène refoulé de l'unité extérieure (20) comparé au cas dans lequel
le total des débits de fluide frigorigène demandés par les unités intérieures (30A
à 30C, 40) est inférieur ou égal au débit maximum du fluide frigorigène refoulé de
l'unité extérieure (20).
7. Système de pompe à chaleur (10, 11) selon l'une quelconque des revendications 1 à
6,
caractérisé en ce que
les unités intérieures (30A à 30C, 40) comprennent :
un deuxième système de circulation (57) faisant circuler un fluide frigorigène subissant
un échange de chaleur avec le fluide frigorigène circulant dans le premier système
de circulation (50a, 50b) ;
un compresseur (52) faisant circuler le fluide frigorigène du deuxième système de
circulation (57) ;
des premiers moyens d'échange de chaleur (41) effectuant un échange de chaleur entre
le fluide frigorigène du premier système de circulation (50a, 50b) et le fluide frigorigène
du deuxième système de circulation (57) pour fonctionner en tant que source de chaleur
de vaporisation du deuxième système de circulation (57) ; et
des moyens de calcul (301, 401) obtenant une quantité de chaleur nécessaire au niveau
des premiers moyens d'échange de chaleur (41) sur la base d'une température primaire
du fluide frigorigène entrant dans le compresseur (52) et d'une température secondaire
du fluide frigorigène refoulé du compresseur (52), et calculant une quantité de chaleur
demandée, définie à partir de la quantité de chaleur obtenue, pour l'unité extérieure
(20).
8. Système de pompe à chaleur (10, 11) selon la revendication 7, caractérisé en ce que
les moyens de calcul (301, 401) obtiennent la température primaire sur la base de
la pression du fluide frigorigène entrant dans le compresseur (52) et obtiennent la
température secondaire sur la base de la pression du fluide frigorigène refoulé à
partir du compresseur (52).
9. Système de pompe à chaleur (10, 11) selon la revendication 7, caractérisé en ce que
les moyens de calcul (301, 401) obtiennent la quantité de chaleur nécessaire au niveau
des premiers moyens d'échange de chaleur (41) le coefficient de performance obtenu
sur la base de la température primaire, de la température secondaire, et d'un rendement
du compresseur (52).
10. Système de pompe à chaleur (10, 11) selon l'une quelconque des revendications 7 à
9, caractérisé en ce que
les unités intérieures (30A à 30C, 40) comprennent des deuxièmes moyens d'échange
de chaleur (51) effectuant un échange de chaleur entre le fluide frigorigène circulant
dans le deuxième système de circulation (57) et l'eau circulant à travers un système
d'alimentation en eau chaude (61),
dans lequel le fluide frigorigène circulant dans le deuxième système de circulation
(57) a une température critique de 60 °C ou plus.
11. Procédé d'ajustement de température,
caractérisé en ce qu'il comprend :
une étape d'obtention des débits de fluide frigorigène nécessaires au niveau des unités
intérieures (30A à 30C, 40) qui sont obtenus à partir des températures cibles de l'air
intérieur des unités intérieures (30A à 30C, 40) et des températures actuelles de
l'air intérieur ;
une étape de calcul de la quantité totale des débits de fluide frigorigène nécessaires
au niveau des unités intérieures (30A à 30C, 40) ; et
une étape d'acquisition des priorités établies dans les unités intérieures (30A à
30C, 40) et de distribution du fluide frigorigène aux unités intérieures (30A à 30C,
40) de manière à fournir aux unités intérieures (30A à 30C, 40) le fluide frigorigène
aux débits nécessaires aux unités intérieures (30A à 30C, 40) dans un ordre des unités
intérieures (30A à 30C, 40) à partir de la priorité établie la plus élevée des priorités
acquises lorsque la quantité totale dépasse la quantité de fluide frigorigène fournie
aux unités intérieures (30A à 30C, 40) à partir d'une unité extérieure (20).
12. Programme permettant à un ordinateur d'exécuter :
une procédure pour obtenir les débits de fluide frigorigène nécessaires au niveau
des unités intérieures (30A à 30C, 40) qui sont obtenus à partir des températures
cibles de l'air intérieur des unités intérieures (30A à 30C, 40) et des températures
actuelles de l'air intérieur ;
une procédure pour calculer la quantité totale des débits de fluide frigorigène nécessaires
au niveau des unités intérieures (30A à 30C, 40) ; et
une procédure pour acquérir les priorités établies dans les unités intérieures et
pour commander les moyens de distribution des unités intérieures (30A à 30C, 40) de
manière à fournir aux unités intérieures le fluide frigorigène aux débits nécessaires
aux unités intérieures (30A à 30C, 40) dans un ordre des unités intérieures (30A à
30C, 40) à partir de la priorité établie la plus élevée des priorités acquises lorsque
la quantité totale dépasse la quantité de fluide frigorigène fournie aux unités intérieures
(30A à 30C, 40) à partir d'une unité extérieure (20).